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Frequently Asked Questions CRT Monitors
Answers Yes, all KDS monitors are Mac compatible. If you have an older Mac, you may require an adaptor to match the video cable connections.
How should I clean my monitor? Turn the monitor off before cleaning with a mild cleaner such as Windex and a soft cloth. Spray the cleaner on the cloth, never directly on the monitor.
Why does my monitor have an odor? As the monitor warms up, some coated parts may give off an odor for the first few hours of operation.
Where can I download the drivers for my monitor? You can download the driver from our web site here. Select your monitor model # from the list and download it. Then follow the instructions for installation of the drivers.
Where can I get the latest drivers for my graphics card? ATI
How would I get support for a KDS monitor in Canada? KDS handles product support for KDS Canada. Contact KDS USA support at 800-283-1311 or support@kdsusa.com.
My monitor displays “Out of Range” or “Out of Scan Range” what can I do?
After clicking the APPLY button, a message similar to the one above will be displayed.
I only have 640x480 with 16 colors, is there a way to fix this? The number of colors and level of resolution are controlled by the video card drivers. The monitor drivers simply tell the Operating System (win, mac, linux, etc..) what kind of monitor it is and its safe operating range. You would need to check and perhaps install or reinstall your video card drivers.
My monitor is a touch screen, where can I get support for it? To receive support for a touch screen monitor, you would need to call the touch screen division of KDS, KDS Pixel Touch. They can be reached at 800-398-6824 or online at http://www.pixeltouch.com/.
How do I get the self-test/no signal screen off? It is all I see. The self-test/no signal screen is displayed when the monitor is not receiving any signal from the computer. Check to make sure that the signal cable (cable going from the monitor to the computer) is plugged in and the computer is on.
There is a slight shadow to the right of everything or there is a wavy vertical line down the center of the screen, sometimes on the left side, how do I get rid of this problem? You probably have an extension cable (NOT THE POWER PLUG) or switch box (KVM) connected between the monitor to the computer. If so, you would need to disconnect the extension cable or switch box and connect the monitor to the computer directly.
What is the maximum resolution my monitor can support? Resolution in CRTs is largely a function of three parameters: dot pitch, beam spot size and RGB bandwidth. The dot pitch of a monitor fixes the size and spacing of phosphor dots on the imaging surface of a CRT. The smaller the dot pitch figure, the closer the phosphor dots are to each other on the imaging surface of the CRT (and, consequently, the smaller the diameter of each individual dot). Dot pitch is not uniform across the screen: it is lowest in the center, and this is the region for which manufacturers give specifications. The local dot pitch at the corner of a picture tube may be noticeably higher than it is at the center, depending on whether or not expensive dynamic beam focusing circuitry is employed. If a monitor has a large dot pitch, it may not be capable of displaying high resolution images even if the monitor will synch up to such signals. This is because there will not be enough physical dots on the screen to allocate one dot to each pixel of a high resolution image. The result of this physical sub sampling will be a blurring of the image. Beam spot size refers to the diameter of the electron beam at the shadow mask. Obviously, if the beam spot is large, it may overlap holes in the mask, blurring the image. Flat-faced picture tubes have more difficulty with beam spot size than tubes with curved faces. This is because the electron gun has a central location in the CRT, so the only way to equalize the distance from the gun to the surface would be for the surface of the CRT to wrap around the gun in a hemisphere. Naturally, this would make a rather unpleasant viewing surface. The screen can be flattened by increasing the radius of the hemisphere, but this makes the picture tube longer and results in a bigger monitor that needs more space behind it on the desktop. The other way to make the surface flatter is to simply allow the gun-to-screen distance to vary across the screen—being higher at the corners and lowest in the center. If the beam spot size is to be maintained over these varying distances, the focus must be changed as the beam sweeps across the screen. This is called dynamic focus and requires fairly sophisticated (and expensive) circuitry. RGB bandwidth determines how fast the electron beam can change state as it sweeps across the screen, setting an upper limit on horizontal resolution. The most torturous image for a CRT is an alternating series of one-pixel-wide vertical B&W lines. The input signal for such a pattern is a square wave, but unfortunately, bandwidth measures only sinusoidal frequency components. The sinusoidal bandwidth required to adequately approximate a square wave is roughly three times the binary frequency of the square wave. The additional bandwidth is required to capture the third harmonic, which is essential if a decent approximation of a square wave is to be obtained (most of the signal energy for a square wave is in the first and third harmonics of its Fourier series). Of course, there is one trivial factor that affects resolution, but it bears stating: the larger the physical dimension of the screen, the more pixels of a given size you can pack onto its face. This is equivalent to stating that at a given dot pitch (or aperture grille), the larger the screen, the higher the resolution the monitor is capable of reproducing with reasonable fidelity.
What is the difference between dot pitch and aperture grille? Monitors create colors with red, green, and blue phosphors. By lighting them up in different intensities, the display creates the illusion of other colors. In the vast majority of tubes, these colored phosphors repeat in patterns, with alternating rows offset from each other. Dot pitch is the distance, center to center, between the two closest dots of the same color; each set of three of the closest red, green, and blue dots is called a triad. Notice that a given dot lies halfway between dots of the two other colors in the row below. Each dot also lies directly above the same color dot two rows below. Shadow Mask In most CRTs, the vertical dot pitch – the vertical distance between the centers of two same-colored dots – matches the diagonal dot pitch, which is the distance between either dot and the closest same-colored dot on the row between the two. Draw lines between the three dots, and you get an equilateral triangle. You can see the difference by examining the horizontal component of the diagonal pitch (the horizontal dot pitch), which turns out to be a useful measurement. When you divide this pitch into the image width, you get the maximum number of triads that fit across the screen--which is also the maximum theoretical resolution the CRT can handle, assuming the monitor electronics are up to it. For a standard CRT, the horizontal dot pitch equals 0.866 times the diagonal pitch, which comes to 0.2252mm horizontal measurement for a 0.26mm diagonal pitch; this calculation is derived from the geometric properties of equilateral triangles. Aperture Grille Finally, be aware that a small number of CRTs – including the Sony Trinitron®, Mitsubishi Diamandtron®, and NEC ChromaClear® -- use vertical stripes of phosphors that run from the top to the bottom of the screen, rather than dots. These CRTs use "stripe pitch" for their measurement--the distance, center to center, between two stripes of the same color. Stripe pitch is equivalent to the horizontal dot pitch in a CRT that uses dots rather than stripes. For example: A Shadow Mask monitor with 0.27mm vertical dot pitch compared to a 0.24mm horizontal dot pitch of an Aperture Grille monitor. These cannot be compared without conversion. Making both dot pitches a horizontal dot pitch will allow for comparison. 0.24mm horizontal dot pitch for Aperture Grille = 0.24mm horizontal dot pitch 0.27mm vertical (or diagonal) dot pitch for a Shadow Mask monitor = 0.23382 = 0.23mm horizontal dot pitch (approx.). OR .24mm horizontal dot pitch for Aperture Grille = 0.27712 = .27mm vertical dot pitch (approx.) .27mm vertical (or diagonal) dot pitch for Shadow Mask monitor = .27mm vertical dot pitch
What is Interlaced vs. Non-Interlaced? A monitor image is produced by refreshing or re-painting the screen, starting at the top and moving to the bottom. The lines of the screen (from top to bottom) are numbered. An Interlaced monitor or video mode paints odd numbered lines first, then even numbered lines. For example: Lines 1, 3, 5, 7, 9, 11, 13, 15 etc are refreshed first, then the monitor starts at line 2, and refreshes lines 2, 4, 6, 8, 10, 12, 14 etc.. (this results in more flicker and poorer quality) A Non-Interlaced monitor or video mode refreshes lines sequentially, 1, 2, 3, 4, etc. (this results in a smooth, flicker-free image)
Why does the image flicker or shake? This flickering is usually caused by one of the following: The refresh rate (measured in vertical Hertz) is set too low. Solution: Try setting this refresh rate to at least 72 Hz. (Do this through the video card setup, not on the monitor.) Flicker or shaking may be caused by another electronic or motorized device, either placed too close to the monitor or plugged into the same electric circuit. (on the same circuit breaker). Solution: Try moving the offending device further away from the monitor, or try turning off all appliances or devices on the same circuit breaker.
Why is the screen image so small? A screen image that is too small may be caused by one of the following:
How do I set my monitor’s setting back to the default? The easiest way is to reset your resolution to a different size. This typically resets the monitor settings. |
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